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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f21989c88a61066c6713b8326d4e0a6f61a916b6ec16aecd4b42ae1652793b' 
  AND token = 'iq5He8Ez7O6KFAJhEoKwZKnD3LfMJ7+1NEgR7UQFxmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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