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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1a6cf42e6add982a988d9137b5480df4a35442b2b341ece067f6432e33f67e' 
  AND token = 'iTdLE82rfS6ejsscejvLYCSnMop5CiCU7ajRGogUlAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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