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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f9a8fe7252f2035873a1659bd6bc5b38c3edfcb583b918743ae948b1270d2a' 
  AND token = 'OzrKO7YNfLOEuuU7BjP6AzKjV2ATNtm4Ndt+WyKFd3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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