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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d55dd8dc8691ecfaf942e760c8a7839b973de23b568473ee8db4529101ce8c4' 
  AND token = 'lXSbZYliOZ7UuJUrLpbygfyHsbC4CYDy8aFUViR1Fh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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