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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619165eb619a6b4ecff80250ce90632bdaddb9c28b1279e37dfa89e2535c3d05' 
  AND token = 'RXdsN5uePaa3jZri+HPOgJobfEnydHOTI7NeJKCMpJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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