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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b023d884d7a1f250c6779227c355d9708a8eab2c394cc4e21ade6176c12e209d' 
  AND token = 'Ogg47k31wrNKNGtw9ZrLL5HVRk0dkohd7vSwdzd5U5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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