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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf3dee1548d6442b1206206b0c998aa2f8303d1dca84fc880d9a0e20d1ed4aa' 
  AND token = 'DQeNRlMiAHvoR15g/yk7opFiBcIhNbVHC3EaUkAzps0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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