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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3501adadb2e8ff80869c259568681af589a0d1ba65b474debb80ec6340f0af62' 
  AND token = 'FjxJs5JxVmZ18JFECDj+sKZOj8/B601+olDh+ae/xdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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