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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670581a51f3a2f47f82d01337072136d18140886c9a7f955e8da4d06434e22f2' 
  AND token = 'K8tcuhgKm7XZ5ftBMpCAVZH0EnyltHZMFAhwOLyja5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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