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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e242616a046b0bda987e19dcd0fa2c478b61acce5124d0a902264ce88448440' 
  AND token = 'xxhohwzM7U0pTRj5Ayxtns+evQFgMRaNQTR9miW0+b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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