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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d625547dcc5604f49e7d3f18e0966a9d881038db461ef4ea86aea52154cb74' 
  AND token = 'Yz34H1javnMHPnPG+eAZSFKIfBo6LFmcwXTZ2HEAfn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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