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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12ec2cf8d953205650eaa36818aacdee960209abbb999fdc67f3b0ea39c74d5' 
  AND token = 'qk7Csh/RlKGlAzSMR1neSgOQly7Ej7qItGAD6O3siCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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