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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e034462cd5f0fcfe7d135f0eb4d1d7839226b5485b2240f1f5a3088d628a7214' 
  AND token = 'FRRM+LUIumABZvpWFUW0L3KXvFvQts255bx/9nNncCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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