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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3a7636f5dfe58e798c3b6e7e638a656bf3cb73ed28e893baa2a7d68f6340ca' 
  AND token = 'TLDSu1hFUS9BOaihgS6xClX83oPGExgbpZpI2yMnpEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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