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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8684c4c7124f47e44dcc55850b3e333efea238abcbcfd67c8f106353c1be73' 
  AND token = 'l/W5QG7ji3xfY6no1ShYBIlK4hh7o6TO8ta3UDrTxNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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