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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15728a5dcb8d87bb1cbc1d512b52aeafea31f203c6a626b21a9ad8c6e4ff0db5' 
  AND token = 'QX6VyWzIeD0viCjzH2n35sE7EabbI/CTVV3uRtAWf9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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