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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69ff430ea13346d67d6c64803d6af9097efb56dc517828a18c3e03d9c5eade5' 
  AND token = 'FiH9W7XOo1qlHsrSguJpdU3wnflc3m5opVll9Zm3DWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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