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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fa55822730526b2ac0f4b037a10bcf6ee7f3e3639a1f1fd24e4effed7762c0' 
  AND token = 'rU6XhYud5BlYp0iM3J2HbbaOa3CfdVpZUnk/4iv7Gjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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