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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca454667c050615ed651490b78a20f3d83c448cb8f20b9efef49b898c0cd4a7' 
  AND token = 'X0yY6KKpCnfFN4ntLnWk+LocsDdex7sjOjn7DQGr/ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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