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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b718df8312f182d4e932b6af172f39f7884b6a360331cc65e68122f2bc79d9e6' 
  AND token = 'eusWiRUuGOgF/I8gS0wuT0fd6utcd5u4zB+3UlShDkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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