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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf9db34499335289515afa40b8f83579351c62dc58e91e8110c62197103871a' 
  AND token = '/NLaAWqbNziprX1fV3sanPTp8P4IWOuMnaWIqHNp0Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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