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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20edc77b57644053b12334e04e666ead2ddcd0c15f268d5b2b1e59490dee90d1' 
  AND token = 'NgkAMmnWscIXDAupHuoO0BrzfdzvRkIn8qDh6uXitxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}