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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d9c36c8ce68322c0c6038da935c91eed1542b0b974165f9f531b87a7677a22' 
  AND token = 'mfSqCPB0JjkQkK3P10CJPz/ivM28eMoZIasLNXMxrto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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