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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db626648b586810dbbf464f70a3f1e39a6b2779834ba1f86aa3f841307570554' 
  AND token = '1z2wc7x2tzpzxLuWD+NN+UPuD7ieYbOSKV3vEpjhbiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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