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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3044f4d365e0a1cd9f485395b1da0b8a559249baf4f654c23aa4b74577844847' 
  AND token = 'H8lqLKbfVgn67A8adbHirvGe17VrzYps71WadTYsB9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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