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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b2d4f64cebac24a50dffbbe23283bfb3a6a03ab2bb5fd5d691099179be28e6' 
  AND token = 'm9atxtsAJq3Um7ckJyzuM4zm+Oy7ghakf1oOLlMsKkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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