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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5961376ee491cadfec97c94f1e8d38c24c555b71d3d50b8682c1561d46e1d1de' 
  AND token = 'l0JaG3OMPiI7QHqRgcCbYoWAQt5hMdJ7qtqlpHqv0Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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