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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db53ac1fa65cf29905f2190f9ec1b9c21c7bd0eb297fddc4a7bf6f0b24f786ed' 
  AND token = 'e8zFuyvp0c4jCYCmc3usTCfd2fToQ1sAaJD2XE41jsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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