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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663020d8e9bcd6a70c24b05a90e91ae5489844a4337b126c8567cd4c8bb847b3' 
  AND token = '1CNHUkrfM5tMTflKzn0nAKfwgMA85ECJQURsyl3miRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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