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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4f059bf2fcfd4abe05ad3e8d85d9c559e2ce239fd1eec9aa4050b3e178ccb2' 
  AND token = 'BiFZabIZzC9FCPIDCOiL5ObOq1OwIcgWqgHT4GHTw4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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