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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcf68bbfe35b0795379dbcc5a0e1810c9122c8dcedea7ec4644547cee4ffb77' 
  AND token = 'HfAq2xfxo8F18c50Zt2yc1N74lL0Yxc6Q1dAG3yuCH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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