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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17446ab6983af86787e7d0286967854ad9d311a9f02227c9f82a7e8aebe122a5' 
  AND token = 'KEi54nBCbtWxlkcVOBp9NmxVtGBITuZzHlUCTBKK6oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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