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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba72931d79d20cceafbad256b4dfe4db31aae2ebeb1cd61faaaea0f401304ce' 
  AND token = '7NQWQ9lKlxy7ipB/9FVkwCZ5J1oreCWmVaprW2/bujI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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