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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3339a5639df2cc2c6b4ca342c4bd8cd0e011b371fe2db4b039cd485ae6c887f' 
  AND token = 'ihEkWUztxmgSHtw8+oiYdJGFg888N4lNNx/fO33hNgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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