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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b674da06d9cbab9ffbe9b400f3ff04e8226126852ac8276950ab901db5a8e16' 
  AND token = 'nkyxfbfVmzEEPc2n8NH4v6sd37PZUKimAfnzrcJJGJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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