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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63aafe110ae6cae0799d07ba9d1507ec63e090fef4a141c05c574c40788a3392' 
  AND token = 'Ixsyp7q4LpEYzJheiD58OxtZxrFQCqZHcdB5ZldUa2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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