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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d1857bce832d6134b87e07e862567e754fc8ba1f87890cc7a15fa26f6474b9' 
  AND token = '2Px+q839ZrvI8SYVhuXAYrfydxeiDf7B41cyNg1UFgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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