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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34b4d2ce8e1463254aeea8451ccb5984a3edf6a064597767a58404dcc4c1b09' 
  AND token = '70jMO1ZT51uVzR1ah75dVz5pcaza+dIDjsJyS2jAzdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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