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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7359501046244c4272e53ed5c11285de4e7b59e33ab401e7e9d9e030796e3a6b' 
  AND token = 'a4m92Q/b70oTV7BONNrnGlA5LTEKrl1TSXUAoh2Jfyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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