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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155e3cb868b120a9a047814f7c2828aa9e82c13c373a9383c35add931beec3bc' 
  AND token = 'oFgkgHJfyrctqnOp1J8o4vRfO1KuzBp3SPX48VA2I+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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