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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c9393fdec81afe78be0810d3f893f5145b544e6831e8688c8afc2517158e40' 
  AND token = 'jk0r4esJyRt3x2LGhTXh4wi1UVt6DheuUwCE5k06OsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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