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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0613e80127e5051e0708f269f7d7f0812917c96a3967f69a4229b8f706d05bf5' 
  AND token = 'beD/mOW8to9IGu0T5Eua07K0XIwAeiKQ31mJvWpMOmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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