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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96ffc0c20d170045ff7f270f367e36a0185d3a690810c9cfb64443f3feb2e80' 
  AND token = 'bE46ske+9iSIp0z0zby+32ORydJThXxFWOmv1FYqcUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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