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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608f5deef2080d71a563220376656e898dccbb26ba0df9e439770780153ad5dd' 
  AND token = 'OFPe485r0yhXdUriJyZp8mXa9Y55BmQsZUX9rCKaI9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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