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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be069dbc89acbd74b450d21e6002839b3b81aaf2b50b64450e593f89a10344c3' 
  AND token = '6+mHsC7aO2rshx6vCHycrdetHaM2PtUbjBxVeqbtp1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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