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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b03c447723118c4eedbfb0429f744244a1b2641dcd0ed9ee742b3085d1f5983' 
  AND token = 'bm8OWbI3CKAAadu6d1tqkPE7W9cSYk42NQLEVd3iB68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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