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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c18a76566939688e08e8cd00a3dfcdfce253fa5de62653e58a70e4502ee77c' 
  AND token = 'ritso87WiojtWCJUT6/7dm1Bi5d/EQMpyWE3Ot4KTUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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