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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e97b881db0c33c77d47fe683722d1c606857f4a48a51718dd41db31b053fcc' 
  AND token = 'Yj1Iufof8aZ7shLAHys108Xgq3ja1qr6ek+xXIjAMWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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