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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7650461aeb9fbf6e2730896779d5ce93444eb96037637ee19a69e720038aed' 
  AND token = '+8MaOao3OKmG6FYJVZktJ9tlBM+YY70Ui8Qr5FEHz38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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