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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cadb9765a4312692dbc41dfab5bf46e2ebfe00d9dd3638e965bee6c13eda23' 
  AND token = '1JYvwWF7igUD9BQOwS2Vftuhitm8uxcOzWqFdnd2SOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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