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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7a5172fdc550b9f1c910d23b661b37330b221a71758e818177d1daefc61dea' 
  AND token = 'v8UUKGhT8wl6QrQPKfeAfjMumyy27RhlovV/tlhO5yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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