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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed3b729f6e26d29fc73f51d0707d1aa2a42b36cdbb05dfee73c98b14ccf68ae7' 
  AND token = 'c6LzelqaX8gpzHIWP/moi+d0IQTL9uziYiTFC2t1Sbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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