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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3d39a52c35d81226331549664044c9a11b3a8d8b686c076c0cb70c57530082' 
  AND token = 'PH7fdXVASojW9ajjKPH9inMKM1L2lp6wwWeWMcrKQCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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