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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339771798a737379379c439be4d7a033ee694478cf651421c61c58910f6fd71e' 
  AND token = 'zYs8BT71gGpnWPHrl2wKnclgBSwR5yEOXTElr6+O0HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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