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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddc3e0fc8522a5401fbf8d11af2387db951cd67684d88cde08f9130a0a71400' 
  AND token = 'fgxyL/vSSFGyAjo7ro9wxjz6NgdyGDvB+1z+j2O2GAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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