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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3469789d7987a6cdc008ff8877602ad851c72b00729227661adfcd087847e44d' 
  AND token = 'dn1Ol4QhxbHcvOsU9IE0Hav3PnkxPt3UGth3WgvcEo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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