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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9db13c1d4eb508d20514d23356a8a555dee61e589c47ab67b080f4fe7a5e933' 
  AND token = 'X6DhLAKsusAraqVvG/3kJaXDAAgtCBgfY26V1DCtKgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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